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Homework Help: Conservation of energy

  1. Oct 30, 2012 #1
    I don't know if I'm setting up the energies correctly.

    1. Two objects are connected by a light string passing over a light, frictionless pulley. The object of mass m1=5.00kg is released from rest at a height h=4m above the table. Using the isolated system model, (a) determine the speed of the object of mass m2=3.00kg just as the 5.00-kg object hits the table and (b) find the maximum height above the table which the 3.00-kg object rises.

    2. E1=Ef

    3. Ei=Ef
    m1gh=m2gh + .5(m1+m2)v2
    5(9.8)(4) = 3(9.8)(4) + .5(8)(v2
  2. jcsd
  3. Oct 31, 2012 #2


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    Welcome to PF!

    Hi Kuklinski! Welcome to PF! :smile:
    Yes, that looks fine. :smile:

    What's worrying you about it? :confused:
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